Material-feed-reel brake



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APP

H. V. JAMES.

LICATION FILED atentefl July 5, 1921..

H. V. JAMES.

MATERIAL FEED REEL BRAKE. APPLICATION HLED MAR. 23, 1918.

Patented July 5, 1921.

3 SHEETS-SHEET 2.

H v. JAMES. MATERIAL FEED REEL BRAKE. APPLICATION FILED MAR 23, 1918- 1383953. Patented July 5, 1921.

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UNITEE Tfii'l HENRY VINCENT JAMES, OF RADLETT, ENGLAND.

MATEBIAL-EEED-REEL BRAKE.

Application filed March 23, 1918.

To all whom it may concern Be it known that I, HENRY VINOENT JAMES, a citizen of the United Kingdom of Great Britain and Ireland, and'resident of Cintra, Aldenham avenue, Radlett, in the county of Hertfordshire, England, have invented certain new and useful Improvements in Material-Feed-Reel Brakes, of which the following is a specification, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to material feed reel brakes and more particularly to electrieally operated brakes for material feed reels used in connection with rewinders, textile, paper making and printing machinery and while applicable for these several purposes it is especially designed for use with paper feed reels of rotary web fed printing presses, to which application my description of the invention will particularly refer. The object of my invention may be described as a means whereby the effective brake applied to a feed reel brake member-at constant radius will be automatically varied as the diameter of the reel and the varying leverage applied to the brake through the reel as it is unwoundand particularly the accomplishment of this object by electrical means, and. without the employment of any apparatus bearing upon the winding face of the feed reel or the material both of which methods allow of detrimental effects upon the material.

As an example, and referring to rotary web fed printing presses I will explain that it is almost invariably necessary to feed paper to the printing cylinders under a constant web tension and that the necessary tension varies widely in different actual printing units whlch may be employed 1n multiple as one printlng press. This tension is usually-obtained by. means of a brake on the feed reel but in earlier patents granted to me I show a means of obtaining constant iweb feed tension other than by brake upon the feedreel, which I therein employ only for the purpose of preventing reel overrun and this present further application has reference also to such brakes, where the degree of brake to prevent overrun must be Specification of Letters Patent.

Patented July 5, 1921.

Serial No. 224,362.

or stopped, and on the other hand where such brake only must be applied as is necessary to overcome the momentum of the reel or minimum diameter to prevent fracture of the web by excessive brake.

My invention consists in the employment of means whereby an electricity controller capable of regulating the effective supply of electrical energy to the electrically operated brake has motion applied to it by the weight of the feed reel through a given travel in a downward direction said weight acting against springs or other counter balance tending to apply motion in the reverse direc tion against the maximum weight of the reel, such springs or counter balance being capable of imparting motion to the regulator in the. reverse direction by overcoming the weight of the reel and imparting motion to the latter in an upward direction as it is unwound and its weight reduced, the various parts being so proportioned that the maximum weight of the reel will cause the necessary maximum travel of the controller in one direction and the springs or counter balance will cause the necessary maximum motion of the controller in the reverse direction with minimum reel diameter and weight. In my co-pending application, Ser. No. 191,979, filed Sept. 18, 1917, is disclosed the form of electro-magnetic brake illustrated in this application.

One method of carrying my invention into effect is shown in the accompanying drawings in which Figure 1 shows part of the side frame and reel bracket of a printing press. Fig. 2 shows the other side of the frame showing the electrically operated brake. Fig. 3 is a front elevation showing certain parts in section and showing the electrical connections between the rheostat, the electro-magnetic brake and the source of current.

a is the reel bracket of a printing press which supportsa feed reel 7), by means of a usual spindle c which is mounted in bearings (5 one only of which is shown. This bearing is movably supported in the bracket 0: and

rests upon the top of springs e. The springs are let into recesses 7 in the bracket a.

On the bracket a I mount a slate or other insulating slab g by means of bars h and on this slab I fit a radial two way switch-z z the brushes j. j of which are mounted upon a pivoted lever is so as to be equally and simultaneously moved when the lever turns upon its pivot. The brushes j j are insulated from the lever at w. Rigidly connected to the lever 70 is short crank Z connected to the bearing d by a link m. V Referring to Fig. 2, it will be seen that a brake drum n is keyed or otherwise suitably "secured to the spindle a; The braking sur- Jan. 6; 1920. 30

face 79 is disposed between the magnetic-pole pieces 7" and 7'. These pole pieces are supported in a cradle s pivoted at to thelside I frame. The magnet coil 2? is disposed between the pole pieces. A spring keeps the braking surface 70 constantly in contact with r the drum n. The pole pieces 1 and r are machined soas to have .a greater radlus from the'center 0 than the surface 29. Conse- 'quently, these pole pieces are always'closely adjacent but neverin contact with the1sur-- face When the magnet is energized, drum= n-partially closes the magnetic field ofthe electromagnet and braking action is established, which' action will vary with the electrical energy fed .to-the magnet. 'This form of electro-magnetic friction brake is disclosed and claimed in my co-pending application, .Ser. No, 191,979, filed Sept. 18, 1917, which became Patent No. 1,327,046,

As shown in: :Fig. 3 a source of current: 10 is connected by wires '11' and-12 to binding posts. 13 and 1e respectively, 'onflthe rheostat. The riheostat has anotherpair'of binding posts 15 and :16 connectedto wires 17 and '18 respectively, which in turn are com nected to a pairofbinding posts 19 and 20 on the brake and connected to the :coil t thereof.- The current from the source 10 passes through wires 11 and'12 to therheostat where it is varied in accordance with f the position thereofand from there passes throughwires 17 and 18t0 the'coil t-to ener- 1 gize the same in accordance with said varied current. 1

It will be seenin the drawing thatthe springs e are supporting the fullweight of the reel?) andit will be evident that as the reelis run off and its weight-decreases the springs will lift the bearing d and with it the linkmthu's turning the lever 70 and moving the brushes 3' j over their contacts thereby regulating thecurrent supplied to the brake in correct proportion to the reduced diameter and weight of'the reel.

lVhat I claim and desire to secure ters-Patentis:"f I m 1. In combination with a spindle for a material feed reel; of a brake acting on said by Let'- spindleto retard rotation thereof; means in which said spindle is vmounted for rising andfalling movements; means for counterbalancing the weight of the spindle'fand the material thereon, said means causing the s'pindletorise as the weight thereon reduces; and means connected, to saidbrakefor 0psprings causing the bearings and spindleto brake for actingaon. said spindle to retard the rotation of'the same, said brake being i mounted for rising and falling movements 7' crating the same and controlled by the rising movements of the spindle for causing the effective braking action of the brake on the spindle to vary as the -m'aterial is fed from f the spindle. a v V 2. In combination with a spindle for a material feed reel of a brake acting on said spindle and comprising abrake drum -m0unted on the spindle, said brake being prof vided to retard the rotation of the spindle; vertically movable bearings in. which the spindle is mounted and wherebyv the spindle is capable of rising and falling movements; springs for counterbalancing the weight of the spindle and the material thereonysaid rise asthe'weight 2011 the spindle decreases;

trolling the effective operation of the brake whereby the braking action of the brake 3. In combination with a spindle for a I materialfeed reel; of a brake drum mounted 1 V on the spindle; vertically movablebearin-gs in. whichthe spindle is mounted and whereby the spindle is capable of rising: and falling movements; springs for counterbalanfd 7 ,7

ing the weight of the spindle anathema: terial thereon, said springs: causing the: spindle to rise as the weight of the material on the spindle decreases'y-and anelectric ,Q 1 brake ,cooperating with: thebrake drum on the spindle and capable "ofretarding'the 1.00

rotation of thespindle; a rheosta-t: electrically connected to said brake; and conneci so means connected to the bearings and. con- Y on the brakedrum is varied as the material is fed'from the spindle.

tions between the rheost-at and the vertically I electric brake as the weight of the'Inateri'al on the spindle'decreases.

4. In cornblnatlon w th .mov-ablezbearings'for operating the rheostat to vary the elfective braking operation of the V I material feed. reel; of an electro=magnetic brake for retarding the rotation Ioflthe spindle shaft; meansin which. the spindle is mounted for rising and falling movetro-magnetio brake on the spindle as the spindle is mounted'for rising' and" falling lie] 7 movementspmeans for counter-balancing the weight of 'the spindle and the "material thereon, said means causingthe spindleato rise as the weightthereon reduces; and a to follow the movements of the spindle. f,

'6. In combination withaspindle' for a mater al I fe dvre g means in wh ch 'said.

spindle is mounted for rising and falling movements; means for counter-balancing the weight of the spindle and the material thereon, said means causing the spindle to rise as the weight of the material thereon is reduced; a brake for acting on said spindle to retard the rotation of the same, said brake being mounted for rising and falling movements to follow the movements of the spindle; and means operated by the means in which the spindle is mounted for controlling the effective brake action of the brake as the spindle rises.

7. In combination with a spindle for a material feed reel; means in which said spindle is mounted for rising and falling movements; means for counter-balancing the weight of the spindle and the material thereon, said means causing the spindle to rise as the Weight of the material thereon is reduced; and an electro-magnetic brake for acting on said spindle to retard the rotation thereof, said electro-magnetic brake being mounted for rising and falling movements to follow the rising and falling movements of the spindle.

8. In combination with a spindle for a material feed reel; means in which said spindle is mounted for rising and falling movements; means for counter-balancing the weight of the spindle and the material thereon, said means causing the spindle to rise as the weight of the material thereon is reduced; anelectro-magnetic brake for acting on said spindle to retard the rotation thereof, said electro-magnetic brake being mounted for rising and falling movements to follow the rising and falling movements of the spindle; and electric current controlling means controlled by the rising movements of the spindle for varying the eflective braking action of the brake.

In Witness whereof I have hereunto set my hand in presence of two witnesses.

HENRY VINCENT JAMES. Witnesses:

LoUIsE ISABEL WILSON, CHRISTINA CLARKE. 

